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4.5 Statistical distributions (A-level only)

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Question 21

A random sample of size n n\,n is taken from a population that is Normally distributed with mean 25 and standard deviation 4.

Find the smallest value of n n\,n for which the probability that the sample mean is greater than 27.5 is less than 1%.

[6]
Markscheme

4.5 Statistical distributions (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.5 Statistical distributions (A-level only)

284 exam-style questions on CCEA A Level Maths 4.5 Statistical distributions (A-level only), covering 4.5.1 Statistical distributions (A-level only) and 4.5.2 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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